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Detailed Reference Information |
Olson, J.V. and Szuberla, C.A.L. (1997). A study of Pc 3 coherence at cusp latitudes. Journal of Geophysical Research 102: doi: 10.1029/97JA00750. issn: 0148-0227. |
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Previous studies have taken data from multi-instrument arrays, both ground-based and in situ, to determine the spatiotemporal characteristics of Pc 3 pulsations (22--100 mHz) at cusp latitudes. Correlations of Pc 3 frequency band magnetometer, photometer, and riometer data have been cited as evidence of a local (ionospheric), rather than a distant (magnetospheric), source for these cusp pulsations. Electron precipitation modulated at Pc 3 frequencies is thought to be the source mechanism for the unstructured portion of the Pc 3 spectrum; such precipitation can modify local ionospheric conductivities, allowing modulated currents to flow at like frequencies. In this paper we undertake a statistical analysis of induction coil magnetometer records taken at Cape Parry and Sachs Harbor, Canada, in May--June 1985. Comparing the distribution functions of interstation X-X and Y-Y polarization and coherence estimates, we arrive at a simple model to estimate an upper bound for the coherence length, (200 km), of Pc 3 source regions near the cusp. Such a determination is an important constraint in identifying the source of Pc 3 frequency band modulations of cusp latitude electron precipitation.¿ 1997 American Geophysical Union |
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Abstract |
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Keywords
Ionosphere, Polar cap ionosphere, Magnetospheric Physics, Magnetopause, cusp, and boundary layers, Magnetospheric Physics, Magnetosphere/ionosphere interactions, Magnetospheric Physics, MHD waves and instabilities, Magnetospheric Physics, Magnetotail boundary layers |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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